Loom



(I. H. DRAWER LO QM Filed Nov.

l2, 1923 2 Shana-Sheet ww m o www wfgw Dec. E?, 1927.

LOOM

Filed Nov. 12, 192:5 2 .Sneemneew Patented Dec. 27, 1927.

UNITED STATES PATENT OFFICE.

CLARE H. DRAPER, OF HOPEDALE, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO DRAPER CORPORATION. yOF HOIEDALE, MASSACHUSETTS, A CORPORA- TION OF MAINE.

LOOM.

Application filed November 12, 1923.

The present invention relates to looms and more particularly to vshuttle box tension controlling and releasing mechanisms for looms.

The loom described in the copending application of Draper SerialNo. 588,77 6, filed September 18, 1922, employs an anti-bang mechanism for moving the whip roll against the force of compression springs to relieve the tension on the warp to prevent a smash in case-the shuttle is improperly picked. This action takes place through binder fingers pressing against the shuttle box binder to depress a dagger into engagement with a sliding frog in case the shuttle is not present in either box on the forward beat of the lay. The loom is also provided with a binder releasing device for removing the pressure on the shuttle during the picking operation which ordinarily occurs approximately atv top center. It has been found that upon operationl of the anti-bang the heavy compression of the whip roll spring tends to move the parts to their original position and to rotate the crank shaft in the reverse direction after the Whip roll has moved forward -to prevent a smash. As the crank shaft rotates from back center to top center the binder pressure is removed by the binder releasing devices so that the dagger is raised clear of the frog and is unable to prevent a smash upon the continued forward motion of the lay. p

The object of the present invention is to improve andv reorganize the loom mechanisms, particularly with a view to preventing reverse motion of the parts after the protector mechanism has been placed in operation. To this end the invention consists in the loom hereinafter described and par-V ticularly defined in the claims.

In the accompanying drawings Fig. l is `an elevation, partly in section7 ofI a loom embodying the several features of the invention; Fig. 2 is a detail showing the means for preventing the reverse rotation of the crank shaft; Fig. 3 is a rear elevation of the parts shown in Fig. 2 arranged in osition onthe loom and Fig. 4 shows the w lip-roll and associated parts.

The illustrated embodiment of the inven-v tion comprises the side frame 4, lay 6, pit man 8, crank 10, crank shaft 12 and crank Serial No 674,158.

shaft hand wheel 14, all of which may be of any usual or preferred construction. The lay carries a pair of shuttle boxes 16, each provided with a binder 18, actuated by a binder finger 2O mounted upon an arm 22 which is attached to or forms a part of the dagger shaft 24. The dagger shaft carries a dagger 26 adapted to engage with a frog 28 which is connected through a link 3() -with the whip roll 3l, whenever the binder fingers are pressed inwardly to indicate shuttle absence from both boxes. The binder fingers are normally urged towards the binders by a spring 32 attached at one end to the loom frame and at the other end to an arm 34 secured to the dagger shaft. The spring 32, together with the binder fingers, constitutes the shuttle box tension y controlling mechanism of .the loom, the operation being such that the tension on the spring 32 is greatest when the lay is at back center and decreases gradually as the lay beats forwardly from back center, so that. a graduated tension is provided on the binders. The pitman carries an angle member 36 which presses against va pivoted binder releasing lever 38 at varying degrees corresponding to the angular position of the lay with respect to the pitman, the action heilig such that the pressure on the binder is removed as the lay passes from a point immediately in front of top center to a point about. 60,o beyond top center as di scribed in the copending application above. referred to. This release of binder pressure takes place during the picking operation.

In order to prevent reverse motion of the parts the pawl 40 is pivoted upon a bracket 42 secured to the side frame and has a lug 44 to limit its movements between lugs 46 on the bracket. The pawl engages with a stop device or ratchet 48 consisting of two parts 50 and 52 which embrace two succes` sive spokes onthe hand wheel and are secured by a bolt 54. The part 52 has an elongated tail 56 which engages and lifts the pawl on each revolution during the normal operation of the loom. The part 52 also has an abrupt shoulder 58 from' which the l 56 the pawl is supported by means of'the lug 44 resting on the lower lug 46 of the bracket.

It will be seen that if for any reason the parts are caused to undergo a motion in the reverse direction after the crank has passed back center they will be stopped by the engagement of the pawl with the shoulder 58 of the stop member. In case the dagger 26 is depressed on the forward beat of the lay to prevent a smash the frog 28 is moved for- Ward, thereby moving the whip roll through the connection 30. The distortion of the whip roll springs 59 tend to pull the frog 28 rearwardly and impart a sudden reverse motion to the lay, causing the crank shaft to turn over in a clockwise direction as viewed in Fig. 1. If it were not for the stopping device the crank might move from back center to top center and through the action of the binder releasing lever 38 the dagger 26 would be raised, thus allowing it to clear the frog and rendering it functionless to move the whip roll 3l to prevent a smash. The first actuation of the protector mechanism would, therefore, in such a case, be unavailing to prevent breakage of the wai-ps by the improperly picked shuttle. According to the present invention, however, the engagement of the pawl with the stop device arrests the motion of the parts while the crank is approximately at back center.

lVhile it is preferred to employ the specific construction and arrangement ot' parts shown and described, it will be understood that this construction and arrangement is not essential except so far as specified in the claims and may be changed or modified without departing from the broader features of the invention.

The invention having been described, what is claimed is:

1 A loom having, in combination, a crank, a crank shaft, a protector mechanism, a whip-roll, a spring for holding the whiprbll in normalI position, connections between the whip-roll and protector mecha- Iiism operating to pullthe whip-roll forward when the protector mechanism is operated, thereby compressing the spring, a stop member rotatable with the crank shaft, a pawl independent of the protector mechanism attached to a stationary part of the loom and lengaging with the stop member on each revolution, the pawl and stop member being arranged to prevent reverse rotation of the crank (due to the compression of the spring) after back center is passed.

2. A loom having, in combination, a lay, shuttle boxes on the lay, binders for the shuttle boxes, binder releases, a crank, connections between the lay and the crank for moving the lay, a protector mechanism, a whip-roll, a spring for holding the whiproll in normal position, connections between the whip-roll and protector mechanism operating to pull the whip-roll forward when the protector mechanism is operated. thereby compressing the spring, and means independent of the protector mechanism for preventing reverse rotation of the crank due to the compression of the spring.

3. A loom having, in combination, a lay, shuttle boxes for the lay, binders, for the shuttle boxes, a binder release mechanism for releasing the binder pressure. during thel picking operation, a crank, connections between tlie crank and the lay, means for rotating the crank, a protector mechanism, a whip-roll, a spring for holding the whiproll in normal position, connections between the whip-roll and protector mechanisn'i operating to pull the whip-roll forward when the protector mechanism is operated, thereby compressing the spring, and means independent of the protector mechanism for preventing reverse rotation of the crank (due to the compression of the spring) including a pawl pivoted upon the loom frame and a stop member rotatable with the crank.

4. A loom having, in combination, a lay, a crank, connections between the lay and the crank, a dagger and frog protector mechanism, an anti-bang device including a whip roll and a spring for holding the roll in normal position, connections between the anti-bang and the frog acting on trip ing of the dagger and movement of the iiog to compress the anti-bang spring, and means independent of the protector mechanism for preventing reverse rotation of the crank which tends to occur due to the reaction of .the anti-bang spring after such compression.

CLARE H. DRAPER. 

